基类和派生类中的依赖注入

Question

我有一个抽象的基础控制器类，所有的动作控制器都派生自它。

构造时的基本 Controller 类初始化 View 对象。这个 View 对象被所有的动作控制器使用。每个动作控制器都有不同的依赖关系（这通过使用 DI 容器来解决）。

问题是Controller基类还需要一些依赖（或参数）， 例如，查看文件夹的路径。问题是 - 在哪里以及如何将参数传递给基本 Controller 类？

$dic = new Dic();

// Register core objects: request, response, config, db, ...

class View
{
    // Getters and setters
    // Render method
}

abstract class Controller
{
    private $view;

    public function __construct()
    {
        $this->view = new View;

        // FIXME: How / from where to get view path?
        // $this->view->setPath();
    }

    public function getView()
    {
        return $this->view;
    }
}

class Foo_Controller extends Controller
{
    private $db;

    public function __construct(Db $db)
    {
        $this->db = $db;
    }

    public function barAction()
    {
        $this->getView()->some_var = 'test';
    }
}

require_once 'controllers/Foo_Controller.php';

// Creates object with dependencies which are required in __construct()
$ctrl = $dic->create('Foo_Controller');

$ctrl->barAction();

Answer 1

这只是一个基本示例。为什么 $view 是私有的？有充分的理由吗？

class View {
  protected $path;
  protected $data = array();

  function setPath($path = 'standard path') {
    $this->path = $path;
  }

  function __set($key, $value) {
    $this->data[$key] = $value;
  }

  function __get($key) {
    if(array_key_exists($key, $this->data)) {
      return $this->data[$key];
    }
  }
}

abstract class Controller {
    private $view;

    public function __construct($path)
    {
       $this->view = new View;

       $this->view->setPath($path);
    }

    public function getView()
    {
        return $this->view;
    }
}

class Foo_Controller extends Controller {
    private $db;


    public function __construct(Db $db, $path)
    {
        // call the parent constructor.
        parent::__construct($path);
        $this->db = $db;
    }

    public function barAction()
    {
        $this->getView()->some_var = 'test';
    }

    public function getAction() {
      return $this->getView()->some_var;
    }
}

class DB {

}

$con = new DB;
$ctrl = new Foo_Controller($con, 'main');

$ctrl->barAction();
print $ctrl->getAction();